CN211333012U - Operation tool for installing positioning pin on precision part - Google Patents
Operation tool for installing positioning pin on precision part Download PDFInfo
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- CN211333012U CN211333012U CN201922036057.8U CN201922036057U CN211333012U CN 211333012 U CN211333012 U CN 211333012U CN 201922036057 U CN201922036057 U CN 201922036057U CN 211333012 U CN211333012 U CN 211333012U
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- positioning pin
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Abstract
The utility model discloses a locating pin installation on precision part is used as industry frock, the operation frock includes blunderbuss and guide holder, the guide holder have the contact part body the location terminal surface and with location terminal surface looks vertically through-hole structure hole, the hole divides into the great guide hole section of diameter and the less hole section of rightting of diameter with step cooperation form, but the guide hole section is used as and assembles with axial displacement mode the blunderbuss, the internal diameter of righting the hole section correspond to the external diameter of the locating pin that will install on the part body, just the axial length of righting the hole section correspond to the locating pin is in install the protruding height after targetting in place on the part body. The utility model discloses can pack into the locating pin mounting hole on the part body with high accuracy technical requirement reliably with the locating pin light, efficient, whole process can not cause the damage to accurate part, good reliability, its locating pin installation of suitable aeroengine's the case of opening to the engine when the maintenance very much.
Description
Technical Field
The utility model relates to an operation instrument that the part equipment was used specifically is a locating pin installation on the precision part is used as industry frock, its equipment of the casing of opening to a machine that suits aeroengine very much.
Background
The aeroengine is praised as a bright pearl on the crown of modern industrial manufacturing industry, and the aeroengine is produced and manufactured in a plurality of technical fields of covering materials, metallurgy, mechanical processing, heat treatment, special processes and the like, is reflected by the national industrial level and is praised as a "state heavy equipment". The casing is an important component part on an aeroengine, and provides a closed space for the whole engine to ensure that airflow smoothly enters, is compressed and pressurized, is fully combusted, expands to do work and forms thrust after being discharged; meanwhile, all units of the aircraft engine are connected to form a complete machine, and an interconnected whole is built for a control system, a fuel system, a transmission system and the like. The casing of the aircraft engine can be divided into an integral casing, a split casing, a special-shaped casing and the like according to the structural form, wherein the split casing formed by combining a left half and a right half in a split mode is the most common.
The split casing of the aircraft engine is mainly formed by butt joint and combination of a left casing half body and a right casing half body of an aluminum alloy casting. In order to ensure the correct positioning of the butt joint combination of the two half casings and reduce the mutual micro-movement in work, a plurality of steel cylindrical positioning pins (referred to as positioning pins for short) for the butt joint combination are arranged on the butt joint binding surfaces of the two half casings, specifically, one end of each positioning pin is fixedly connected with a positioning pin mounting hole (blind hole structure) of one half casing in an interference fit manner, and the other end of each positioning pin is movably connected with a positioning pin mounting hole (blind hole structure) of the other half casing in a transition fit manner.
After the aero-engine with the split case is used for a certain time, fretting wear can be generated on the butt joint binding surfaces of the two case half bodies, so that the pressure bearing area is reduced, the case is further deformed, and the sealing performance of the aero-engine and the normal operation of all component parts of the aero-engine can be directly influenced. Therefore, after the aero-engine with the split casing is used for a certain period of time, the abutting joint surfaces of the two casing halves of the casing need to be repaired on schedule or on demand, which involves dismounting the positioning pin on the casing half connected with the positioning pin in an interference fit structure and mounting the positioning pin after repair (note that the positioning pin mounting mentioned below refers to the positioning pin fixedly connected to the part body in the interference fit structure).
Based on the high precision of the aircraft engine, the operations of disassembling and assembling the casing belong to high-precision operations, the left and right casing half bodies are strictly prevented from being damaged, and the installation precision of each part is strictly controlled. The installation of the locating pin on the half body of the casing needs to simultaneously meet the following two technical conditions:
1. the positioning pin is required to be perpendicular to the butt joint binding surface of the half case body when being installed on the butt joint binding surface of the half case body;
2. the protruding height (i.e. the exposed part) of the positioning pin which is installed in place on the butt joint binding surface of the half casing body needs to meet the design requirement value, i.e. the precision requirement of the design size.
The two installation technical conditions directly affect the reliability and precision of the direct butt joint combination of the half casing body and the other half casing body.
At present, the locating pin installation on the receiver halfbody is because of lacking the special operation frock of effective ground of going, mainly installs with the traditional operation mode that the hammer was strikeed, and concrete operation process is: firstly, butting a positioning pin at a corresponding positioning pin mounting hole on a casing half body; then, directly knocking and pushing the positioning pin from the rear end (the end part exposed after being arranged in place) of the positioning pin by adopting the hammer, wherein the knocking and pushing depth is judged according to the subjective experience of an operator; and then, according to the installation depth condition judged by subjective experience, an operator measures the positioning pin protruding from the butt joint binding surface of the half casing body by using a depth gauge, guides the next action of hammer knocking according to the measurement result, and repeats the steps until the perpendicularity and the protruding height of the positioning pin on the butt joint binding surface of the half casing body meet the design requirement values.
It can be clearly seen from the above installation process that repeated knocking, measurement and knocking are required, the operation process is complex and tedious, the operation technology difficulty is high, the operation efficiency is low, and the installation accuracy is difficult to guarantee. In addition, the installation operation mode that the hammer is directly knocked and pushed in is easy to incline the positioning pin in the knocking and pushing process, so that the installation verticality of the positioning pin on the casing half body can be influenced, and the damage to the positioning pin installation hole on the casing half body can be caused.
SUMMERY OF THE UTILITY MODEL
The technical purpose of the utility model is that: aiming at the particularity of the installation operation of the positioning pin on the precision part and the technical defects of the existing operation tool, the operation tool which can not damage the precision part and can easily and efficiently install the positioning pin into the positioning pin installation hole on the part body with high precision technical requirements is provided to be used for installing the positioning pin on the precision part.
The technical purpose of the utility model is realized through the following technical scheme: the utility model provides a locating pin installation is used as industry frock on precision part, the operation frock includes blunderbuss and guide holder, the guide holder has the location terminal surface of contact part body, and with through-hole structure hole perpendicular to the location terminal surface mutually, the hole is divided into the great guide hole section of diameter and the less hole section of righting of diameter with step cooperation form, but the guide hole section is used for assembling with axial displacement the blunderbuss, but the internal diameter of righting the hole section corresponds the external diameter of the locating pin that will install on the part body, just the axial length of righting the hole section corresponds the protruding height after the locating pin is in place on the part body.
Preferably, a gasket capable of lengthening the axial length of the centralizing hole section is detachably assembled in the guide hole section of the guide seat, and a step matching surface is formed between the gasket and the guide hole section. Further, the gasket is of an annular structure.
Preferably, the guide seat mainly comprises a handle part with a smaller outer diameter and a positioning part with a larger outer diameter, which form a T-shaped structure, the positioning end surface on the guide seat is the bottom surface of the positioning part, and the outer wall of the handle part of the guide seat is provided with a hand-pinching friction-increasing structure. Furthermore, the positioning part on the guide seat is of a rectangular structure corresponding to the plane of the positioning pin mounting hole on the part body.
As one preferable scheme, the end part of the punch, which extends into the guide hole section on the guide seat, is provided with an ejection head part, the outer diameter of which is larger than the inner diameter of the righting hole section on the guide seat, and the outer wall of the ejection head part is in clearance fit with the inner wall of the guide hole section. Furthermore, the outer wall of the ejection head of the punch is provided with at least one vent groove. The clearance value of the clearance fit is 0.01-0.04 mm. The blunderbuss is provided with a handle part which is positioned outside the guide hole section on the guide seat and has an outer diameter larger than the inner diameter of the guide hole section, the distance between the front end surface of the handle part on the blunderbuss and the front end surface of the ejection head of the blunderbuss is at least equal to the axial length of the guide hole section, and the outer wall of the handle part of the blunderbuss is provided with a hand-pinching friction-increasing structure. The back end of the drift pin is provided with a knocking head with the outer diameter smaller than that of the handle part on the drift pin. Furthermore, the outer wall of the ejection head of the punch is provided with 2-4 air grooves, the air grooves are uniformly distributed on the outer wall of the ejection head in the circumferential direction, and each air groove is along the axial direction of the ejection head. The outer diameter of the rod body between the handle part and the ejection head part on the drift pin is smaller than that of the ejection head part.
Preferably, the precision part is a split casing of an aircraft engine.
The utility model has the beneficial technical effects that:
1. the utility model is designed aiming at the particularity of the installation operation of the positioning pin on the precision part, the positioning pin which is pre-installed in the corresponding positioning pin installation hole on the part body is positioned and righted by the guide seat, the positioning pin which is righted by the guide seat is knocked by the blunderbuss self which is axially sheathed in the guide seat and/or the transmitted torque, so that the knocked positioning pin can smoothly and rapidly enter the corresponding positioning pin installation hole on the part body in a state of meeting the technical requirement of verticality, and the positioning pin is ensured to be installed in place in accordance with the technical requirement of the design exposed size by the step structure between the guide hole section and the righting hole section in the guide seat, thereby the positioning pin is easily and efficiently installed in the positioning pin installation hole on the part body in a reliable way in accordance with the technical requirement of high precision, and the whole process can not cause damage to, the reliability is good, and the positioning pin is particularly suitable for installing the positioning pin of the split casing of the aircraft engine during maintenance;
2. the liner assembled in the guide hole section on the guide seat can be easily replaced, and the thickness of the liner is set according to the corresponding matching relation between the protruding height and the axial length of the righting hole section according to the design requirement of the positioning pin; the liner is matched with the guide hole section to limit the punch pin which moves axially, so that the righting hole section on the guide seat is matched to reliably guarantee the protruding height of the positioning pin which is installed in place on the part body, and the flexibility and the universality of the utility model are enhanced;
3. the forming structure of the guide seat of the utility model can realize stable, accurate and reliable positioning on the part body (especially the positioning part on the guide seat is more prominent as a rectangular structure), and can be conveniently operated by hand;
4. the utility model discloses the structure that the blunderbuss barrel stretches into in the guide holder has both ensured that the blunderbuss barrel carries out axial free sliding displacement in the guiding hole section on the guide holder (this is especially more obvious under the air channel on the ejection head is assisted, the air channel can effectively dredge the resistance of the gas in the guide holder to the blunderbuss barrel of axial displacement), has also ensured that the stair structure in the guide holder carries out spacing reliably to the axial displacement of blunderbuss barrel, can also make the axial free sliding displacement of blunderbuss barrel and axial vertical sliding displacement realize considering steadily, in order to guarantee the smoothness, the high efficiency of installation operation and the accuracy nature of installation result;
5. the handle part on the blunderbuss of the utility model is convenient for hand-held operation; in addition, the knocking head at the rear end of the handle part is used for bearing external knocking force (such as a hammer), and the matching relation between the knocking head and the handle part avoids the damage of external knocking on the handle part and is favorable for ensuring the safety of the knocking operation on the hand-held operation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a view a-a of fig. 1.
Fig. 3 is a perspective view of the present invention.
Fig. 4 is a reference diagram of the usage status of the present invention.
The reference numbers in the figures mean: 1-a sulfonium; 11-ejecting the head; 12-knocking the head; 13-a handle portion; 14-a vent channel; 2, a guide seat; 21-righting the hole section; 22-a pilot hole section; 23-a handle portion; 24-a positioning section; 25-positioning the end face; 3, lining; 4-part body; and 5, positioning pins.
Detailed Description
The utility model relates to an operation instrument that part equipment was used, specifically be a locating pin installation on the precision part is used as industry frock, below with aeroengine's casing of running from opposite directions as the object (the part body that will be described below is the casing halfbody of aeroengine casing of running from opposite directions), it is right through a plurality of embodiments the utility model discloses a main part technical content carries out the detailed description, wherein, embodiment 1 combines the description attached drawing-figure 1, figure 2, figure 3 and figure 4 are right the utility model discloses a main part technical content goes on clearly, directly perceived detailed description, though other embodiments do not draw alone and correspond the attached drawing again, its main part technical scheme still can refer to the attached drawing of embodiment 1.
It is expressly stated here that the drawings of the present invention are schematic, and unnecessary details have been simplified for the purpose of clarity in order to avoid obscuring the technical solutions that contribute to the prior art.
Example 1
Referring to fig. 1, 2 and 3, the utility model comprises a blunderbuss 1 and a guide seat 2 which are axially sleeved together.
The guide holder 2 mainly comprises a cylindrical handle 23 and a rectangular positioning portion 24, which form an inverted T-shaped stepped structure, that is, the outer diameter of the handle 23 is smaller, and the outer diameter of the positioning portion 24 is larger. The outline of the positioning portion 24 should correspond to the plane of the positioning pin mounting hole on the part body 4 (i.e. the abutting surface on the casing halves of the split casing), which mainly requires that the positioning portion 24 at least coincide with the plane of the part body 4 at the periphery of the positioning pin mounting hole. The positioning portion 24 is a positioning structure for the guide seat 2 to be in contact fit with the part body, and has a positioning plane, i.e. a positioning end surface 25, and the positioning end surface 25 is a bottom surface of the positioning portion 24, in other words, the positioning end surface 25 on the guide seat 2 is a bottom surface of the positioning portion 24. The handle portion 23 serves as a holding portion for holding the handle during the attachment operation, and is provided with a friction-increasing structure, such as a net-like knurl, on the outer wall thereof for the purpose of pinching by hand.
The construction of the guide shoe 2 is, in addition to the above, the essential construction, namely that the guide shoe 2 has a through-hole-structure inner bore perpendicular to its locating end face 25, which is divided in a stepped manner into a guide bore section 22 of larger diameter and a centering bore section 21 of smaller diameter. The guide hole section 22 serves for mounting the punch 1 in an axially displaceable manner. The inner diameter of the righting hole section 21 is slightly larger than the outer diameter of the positioning pin 5 to be installed on the part body 4, and preferably, the positioning pin 5 can be transitionally assembled in the righting hole section 21; furthermore, the axial length of the centering bore section 21 should correspond to the protrusion height of the locating pin 5 after it has been mounted in place on the fitting body 4, i.e. the axial length of the centering bore section 21 determines the length of the exposed portion of the locating pin 5 after it has been mounted on the fitting body 4.
In the above structure, since the axial length of the centering hole section 21 in the guide seat 2 is specific, one guide seat 2 can only be installed for one type of positioning pin with the designed exposed length, and if another type of positioning pin with the designed exposed length needs to be installed, the guide seat with the specific centering hole section is not suitable for use and is not universal. In order to solve the general problem, the axial length of the centralizing hole section 21 is designed according to the minimum exposed length of each positioning pin to be installed, or is designed to be smaller than the minimum exposed length; meanwhile, a detachable (e.g., clearance-fit) gasket 3 is arranged in the guide hole section 22 of the guide seat 2, the gasket 3 is of an annular structure, the thickness of the gasket 3 is set according to the corresponding matching relationship between the projection height and the axial length of the centering hole section according to the design requirement of the positioning pin to be installed, that is, the gasket is used for complementing the difference between the design requirement value of the exposed length of the centering hole section and the design requirement value of the exposed length of the positioning pin to be installed, that is, the gasket is required to lengthen the axial length of the centering hole section. The liner 3 is sleeved in the guide hole section 22 of the guide seat 2 in a detachable structure, preferably, the outer diameter of the liner 3 is in clearance fit with the inner diameter of the guide hole section 22, and the value range of the clearance fit is randomly selected within the range of 0.01-0.04 mm; the inner diameter of the liner 3 corresponds to the inner diameter of the centralizing bore section 21; the liner 3 sleeved in the guide hole section 22 is located on the original step structure between the guide hole section 22 and the centering hole section 21, so that a step matching surface is formed between the liner 3 and the guide hole section 22, and the step surface is a new step surface matched with the centering hole section 21 and the guide hole section 22, so that the centering hole section with adjustable axial length 21 is formed by combining the self centering hole section on the guide seat 2 and the inner hole of the liner 3 in the axial direction, and is used for positioning and centering the positioning pin.
The punch 1 is a long rod structure. The punch pin 1 extends into the guide hole section 22 on the guide seat 2 by using a rod body with the outer diameter smaller than the inner diameter of the guide hole section 22 on the guide seat 2, and the end part of the punch pin 1 extending into the guide hole section 22 is provided with an ejection head part 11 with the outer diameter slightly smaller than the inner diameter of the guide hole section 22 and larger than the inner diameter of the righting hole section 21, namely the front end part of the punch pin 1 is in a coaxial step structure; the outer wall of the ejection head 11 of the punch 1 and the inner wall of the guide hole section 22 form clearance fit, and the value range of the clearance fit is randomly selected within the range of 0.01-0.04 mm. When the ejecting head 11 of the blunderbuss 1 is attached to the step in the guide seat 2, the rod body of the blunderbuss 1 extends out of the guide hole section 22 of the guide seat 2, the rod body of the blunderbuss 1 outside the guide hole section 22 is provided with a handle part 13 with the outer diameter larger than the inner diameter of the guide hole section 22, namely, the handle part 13 of the blunderbuss 1 is positioned outside the guide hole section 22 on the guide seat 2, and the distance from the front end surface of the handle part 13 on the blunderbuss 1 to the front end surface of the ejecting head 11 of the blunderbuss 1 is larger than the axial length of the guide hole section 22. The handle part 13 of the drift pin 1 is used as a hand-held part during the mounting operation, and the outer wall of the drift pin is provided with friction-increasing structures such as net-shaped knurls and the like during the hand-pinching operation. In addition, the rear end of the drift pin 1 is provided with a knocking head 12 with an outer diameter smaller than that of a handle part 13 on the drift pin 1, namely, a coaxial step structure is formed between the knocking head 12 and the handle part 12.
Two air grooves 14 are formed in the outer wall of the ejection head 11 of the punch pin 1, each air groove 14 is formed along the axial direction of the ejection head 11, the depth of each air groove 14 corresponds to the convex thickness of the ejection head 11 on the rod body of the punch pin 1, so that the front end and the rear end of the ejection head 11 are communicated, air in the guide hole section 22 can be effectively guided during operation, and axial displacement resistance of the punch pin is reduced. The two ventilation slots 14 on the ejection head 11 are uniformly distributed along the circumference of the ejection head 11, i.e. the two ventilation slots 14 are uniformly arranged on the outer wall of the ejection head 11 in the circumference direction.
Referring to fig. 4, the operation process of installing the positioning pin 5 on the component 4 of the present invention is roughly as follows:
firstly, butting the positioning pin 5 at a corresponding positioning pin mounting hole on the part body 4;
the guide seat 2 is sleeved on the positioning pin 5 through the centering hole section 21, the positioning end face of the guide seat 5 is in smooth contact with the surface on the part body 4, the centering hole section 21 and the positioning pin mounting hole are substantially coaxial through the matching of the positioning pin 5, the positioning pin mounting hole and the centering hole section 21, and the guide seat 2 is kept fixed relative to the part body 4;
then axially displacing the punch 1 so that the gravity of the punch 1 strikes the positioning pin 5 to force the positioning pin 5 into the positioning pin mounting hole on the part body 4, indicating that the positioning pin 5 is mounted in place when the punch 1 is axially displaced in the guide 2 to the mating step between the guide hole section 22 and the righting hole section 21; of course, if the impact force of the hand-held punch 1 is not enough to knock the positioning pin 5 in, the hammer can knock the knocking head 12 of the punch 1 to make the punch 1 transmit force.
Example 2
The rest of the present embodiment is the same as embodiment 1, except that: four ventilation grooves are arranged on the outer wall of the ejection head of the punch pin.
Example 3
The rest of the present embodiment is the same as embodiment 1, except that: the outer wall of the ejection head of the punch is provided with three ventilation grooves.
Example 4
The rest of the present embodiment is the same as embodiment 1, except that: the guide seat is a straight cylinder structure, namely the outer contour of the guide seat is in a 1 shape, and the bottom surface of the guide seat is used as a positioning end surface.
The above examples are only for illustrating the present invention and are not to be construed as limiting the same. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the specific technical solutions of the above embodiments can be modified, or some technical features can be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.
Claims (10)
1. The utility model provides a locating pin installation is used as industry frock on precision part which characterized in that: the operation tool comprises a punch pin (1) and a guide seat (2), wherein the guide seat (2) is provided with a positioning end face (25) contacting a part body (4) and a through hole structure inner hole perpendicular to the positioning end face (25), the inner hole is divided into a guide hole section (22) with a larger diameter and a righting hole section (21) with a smaller diameter in a step matching mode, the guide hole section (22) is used for assembling the punch pin (1) in an axial displacement mode, the inner diameter of the righting hole section (21) corresponds to the outer diameter of a positioning pin (5) to be installed on the part body (4), and the axial length of the righting hole section (21) corresponds to the protruding height of the positioning pin (5) installed in place on the part body (4).
2. The precision part positioning pin installation tool of claim 1, which is characterized in that: the guide hole section (22) of the guide seat (2) is internally detachably provided with a gasket (3) capable of lengthening the axial length of the centralizing hole section (21), and a step matching surface is formed between the gasket (3) and the guide hole section (22).
3. The precision part positioning pin installation tool as claimed in claim 1 or 2, wherein: the guide holder (2) mainly constitute T type structure by handle portion (23) that the external diameter is less and location portion (24) that the external diameter is great, location terminal surface (25) on guide holder (2) are the bottom surface of location portion (24), the handle portion (23) outer wall of guide holder (2) is provided with the hand and holds between the fingers and increase the friction structure.
4. The precision part positioning pin installation tool of claim 3, which is characterized in that: the positioning part (24) on the guide seat (2) is of a rectangular structure corresponding to the plane of the positioning pin mounting hole on the part body (4).
5. The precision part positioning pin installation tool of claim 1, which is characterized in that: the end part of the punch pin (1) extending into the guide hole section (22) on the guide seat (2) is provided with an ejection head part (11) with the outer diameter larger than the inner diameter of the righting hole section (21) on the guide seat (2), and the outer wall of the ejection head part (11) is in clearance fit with the inner wall of the guide hole section (22).
6. The precision part positioning pin installation tool of claim 5, which is characterized in that: the outer wall of the ejection head (11) of the punch pin (1) is provided with at least one ventilation groove (14).
7. The precision part positioning pin installation tool of claim 5, which is characterized in that: the clearance value of the clearance fit is 0.01-0.04 mm.
8. The precision part positioning pin installation tool as claimed in claim 1 or 5, wherein: the blunderbuss (1) is provided with a handle part (13) which is positioned outside a guide hole section (22) on the guide seat (2) and has an outer diameter larger than the inner diameter of the guide hole section (22), the distance from the front end surface of the handle part (13) on the blunderbuss (1) to the front end surface of an ejection head part (11) of the blunderbuss (1) is at least equal to the axial length of the guide hole section (22), and the outer wall of the handle part (13) of the blunderbuss (1) is provided with a hand-pinching friction-increasing structure.
9. The precision part positioning pin installation tool of claim 8, wherein the tool comprises: the back end of the drift pin (1) is provided with a knocking head part (12) with the outer diameter smaller than that of a handle part (13) on the drift pin (1).
10. The precision part positioning pin installation tool of claim 1, which is characterized in that: the precision part is a split casing of the aero-engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922036057.8U CN211333012U (en) | 2019-11-22 | 2019-11-22 | Operation tool for installing positioning pin on precision part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922036057.8U CN211333012U (en) | 2019-11-22 | 2019-11-22 | Operation tool for installing positioning pin on precision part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211333012U true CN211333012U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922036057.8U Expired - Fee Related CN211333012U (en) | 2019-11-22 | 2019-11-22 | Operation tool for installing positioning pin on precision part |
Country Status (1)
| Country | Link |
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| CN (1) | CN211333012U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008358A (en) * | 2021-03-03 | 2022-09-06 | 中国航发商用航空发动机有限责任公司 | Positioning and mounting tool |
-
2019
- 2019-11-22 CN CN201922036057.8U patent/CN211333012U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115008358A (en) * | 2021-03-03 | 2022-09-06 | 中国航发商用航空发动机有限责任公司 | Positioning and mounting tool |
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Granted publication date: 20200825 Termination date: 20211122 |